Auxiliary Exchange in the IKEv2 Protocol
draft-smyslov-ipsecme-ikev2-aux-01

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Network Working Group                                         V. Smyslov
Internet-Draft                                                ELVIS-PLUS
Intended status: Standards Track                           July 27, 2018
Expires: January 28, 2019

                Auxiliary Exchange in the IKEv2 Protocol
                   draft-smyslov-ipsecme-ikev2-aux-01

Abstract

   This documents defines a new exchange, called Auxiliary Exchange, for
   the Internet Key Exchange protocol Version 2 (IKEv2).  This exchange
   can be used for transferring large amount of data in the process of
   IKEv2 Security Association (SA) establishment.  Introducing Auxiliary
   Exchange allows to re-use existing IKE Fragmentation mechanism, that
   helps to avoid IP fragmentation of large IKE messages, but cannot be
   used in the initial IKEv2 exchange.

Status of This Memo

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   This Internet-Draft will expire on January 28, 2019.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Smyslov                 Expires January 28, 2019                [Page 1]
Internet-Draft         Auxiliary Exchange in IKEv2             July 2018

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology and Notation  . . . . . . . . . . . . . . . . . .   3
   3.  Auxiliary Exchange Details  . . . . . . . . . . . . . . . . .   3
     3.1.  Support for Auxiliary Exchange Negotiation  . . . . . . .   3
     3.2.  Using Auxiliary Exchange  . . . . . . . . . . . . . . . .   4
     3.3.  IKE_AUX Protection and Authentication . . . . . . . . . .   4
       3.3.1.  Protection of IKE_AUX Messages  . . . . . . . . . . .   4
       3.3.2.  Authentication of IKE_AUX Exchanges . . . . . . . . .   5
     3.4.  Error Handling in IKE_AUX . . . . . . . . . . . . . . . .   7
   4.  Interaction with other IKEv2 Extensions . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The Internet Key Exchange protocol version 2 (IKEv2) defined in
   [RFC7296] uses UDP as a transport for its messages.  If size of the
   messages is large enough, IP fragmentation takes place that may
   interfere badly with some network devices.  The problem is described
   in more detail in [RFC7383], which also defines an extension to the
   IKEv2 called IKE Fragmentation.  This extension allows IKE messages
   to be fragmented at IKE level, eliminating possible issues caused by
   IP fragmentation.  However, the IKE Fragmentation cannot be used in
   the initial IKEv2 exchange, IKE_SA_INIT.  This limitation in most
   cases is not a problem, since the IKE_SA_INIT messages used to be
   small enough to not cause IP fragmentation.

   Recent progress in Quantum Computing has brought a concern that
   classical Diffie-Hellman key exchange methods will become insecure in
   a relatively near future and should be replaced with Quantum Computer
   (QC) resistant ones.  Currently most of QC-resistant key exchange
   methods have large public keys.  If these keys are exchanged in the
   IKE_SA_INIT, then most probably IP fragmentation would take place,
   therefore all the problems caused by it would become inevitable.
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